/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.functional.functional;

import org.mule.runtime.core.api.MuleEventContext;

/**
 * A test callback that writes the results of a service invocation to the response output stream of the event This should only be
 * used when testing Asynchronous calls with the {@link FunctionalTestComponent} otherwise you will get duplicate messages, since
 * both this class and the {@link FunctionalTestComponent} will write a return message back to the callee.
 *
 * @see FunctionalTestComponent
 */
public class ResponseWriterCallback extends CounterCallback {

  @Override
  public void eventReceived(MuleEventContext context, Object component) throws Exception {
    if (context.getExchangePattern().hasResponse()) {
      throw new IllegalStateException("The ResponseWriterCallback should not be used for synchronous tests as it will cause two copies of the message to be written back to the client");
    }
    super.eventReceived(context, component);

    String result = context.getMessageAsString() + " Received Async";
    if (context.getOutputStream() == null) {
      throw new IllegalArgumentException("event context does not have an OutputStream associated");
    }

    context.getOutputStream().write(result.getBytes());
    context.getOutputStream().flush();
  }
}
